Fluorescence dynamics of bodipy molecules on ito thin film

Abstract

Fluorescence dynamics of bodipy dye molecules deposited on Indium Tin Oxide (ITO) thin films is studied in this thesis. Bodipy molecules deposited on ITO thin films of different thicknesses and resistivities are analyzed by means of lifetimes using time correlated single photon counting technique. Bodipy dyes act as dipoles on the ITO surface. It is envisaged that the electric field of the dipole radiation, which is produced by a bodipy molecule located on a metal planar surface, can be enhanced or inhibited via its image dipole according to the orientation of the prime dipole. The parallel orientation of the bodipy dipole gives rise to enhancement of lifetime since the image dipole’s field quenches the field of the prime dipole. This effect results in a considerable enhancement in the dye’s lifetime, from 2.57 ns up to 4.76 ns. In addition, it is observed that the resistivity of the films are effective on the emission rates of the bodipy dye molecules rather than the film thickness.